Installed H&S Mini Maxx, DPF/cat delete, and S&B on my '08 F250 several weeks ago - truck has 8" lift and 37's. Left it alone with the mild tune (ran the 225 tune) and the Firm 55mph lock up - also recalibrated the stock speedo via the Mini Maxx so that the readout on the factory speedo and mini is the same.
However, I noticed that when accelerating on the freeway, I consistently had to run the truck up to over 2100rpm and 65mph in order to get it to lock up. Repeated this multiple times and it was dead nuts on the lock up at 65mph every time.
So, after filling up today and not being overly impressed with my 13.8mpg, most of which was highway, I decided to download a new tune. I installed the Hot Damm tune (running the 250) and the Firm 45mph Lock Up.
Took it out to test the new setup, and it consistently would not lock up until 52mph, not 45mph. And if it dropped from 52mph down to 50, it started bouncing in and out of gears.
Called up H&S, and they said I am accelerating too hard, thus causing it to lock up later than 45mph. Said that it has to be less than 18% throttle. So, I went back out just now and kept it below 10% throttle to try and get it to lock up at 45mph. No such luck - still locking up at 52mph.
Anybody have any ideas or similar experience? I've done alot of searching on here and haven't been able to find any answers.
Any help would be apprecited, or feel free to tell me I'm an idiot and that's what I get with a lifted truck.